Used Optolong SII 6.5nm filter, 1.25"


  • Sale
  • $89.95
  • Regular price $159.00

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Not Returnable Please note that used items are not returnable.

Condition: This is a used Optolong SII 6.5nm imaging narrow band filter in great condition. The optics are clean and it comes in a plastic case. 



Improved narrowband SII 6.5nm filter (Sulfur II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).